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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> *  Licensed to the Apache Software Foundation (ASF) under one</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *  or more contributor license agreements.  See the NOTICE file</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> *  distributed with this work for additional information</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> *  regarding copyright ownership.  The ASF licenses this file</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> *  to you under the Apache License, Version 2.0 (the</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *  "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *  with the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *    <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> *  Unless required by applicable law or agreed to in writing,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> *  software distributed under the License is distributed on an</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> *  KIND, either express or implied.  See the License for the</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> *  specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <em class="jxr_comment"> *  under the License.</em>
<a class="jxr_linenumber" name="18" href="#18">18</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">package</strong> org.apache.directory.mavibot.btree;
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> java.io.Closeable;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a class="jxr_linenumber" name="25" href="#25">25</a>  <strong class="jxr_keyword">import</strong> java.nio.ByteBuffer;
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.nio.channels.FileChannel;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.Map;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.ConcurrentLinkedQueue;
<a class="jxr_linenumber" name="29" href="#29">29</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.locks.ReentrantLock;
<a class="jxr_linenumber" name="30" href="#30">30</a>  
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.Cache;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.Status;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> net.sf.ehcache.config.CacheConfiguration;
<a class="jxr_linenumber" name="34" href="#34">34</a>  
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.exception.KeyNotFoundException;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.slf4j.Logger;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.slf4j.LoggerFactory;
<a class="jxr_linenumber" name="38" href="#38">38</a>  
<a class="jxr_linenumber" name="39" href="#39">39</a>  
<a class="jxr_linenumber" name="40" href="#40">40</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment"> * The B+Tree MVCC data structure.</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> * @param &lt;K&gt; The type for the keys</em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * @param &lt;V&gt; The type for the stored values</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> *</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:dev@directory.apache.org" target="alexandria_uri">mailto:dev@directory.apache.org</a>"&gt;Apache Directory Project&lt;/a&gt;</em>
<a class="jxr_linenumber" name="47" href="#47">47</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="48" href="#48">48</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> PersistedBTree&lt;K, V&gt; <strong class="jxr_keyword">extends</strong> AbstractBTree&lt;K, V&gt; <strong class="jxr_keyword">implements</strong> Closeable
<a class="jxr_linenumber" name="49" href="#49">49</a>  {
<a class="jxr_linenumber" name="50" href="#50">50</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The LoggerFactory used by this class */</em>
<a class="jxr_linenumber" name="51" href="#51">51</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> Logger LOG = LoggerFactory.getLogger( PersistedBTree.<strong class="jxr_keyword">class</strong> );
<a class="jxr_linenumber" name="52" href="#52">52</a>  
<a class="jxr_linenumber" name="53" href="#53">53</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The <a href="../../../../../org/apache/directory/mavibot/btree/RecordManager.html">RecordManager</a> if the <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> is managed */</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>      <strong class="jxr_keyword">private</strong> <a href="../../../../../org/apache/directory/mavibot/btree/RecordManager.html">RecordManager</a> recordManager;
<a class="jxr_linenumber" name="55" href="#55">55</a>  
<a class="jxr_linenumber" name="56" href="#56">56</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The cache associated with this <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> */</em>
<a class="jxr_linenumber" name="57" href="#57">57</a>      <strong class="jxr_keyword">protected</strong> Cache cache;
<a class="jxr_linenumber" name="58" href="#58">58</a>  
<a class="jxr_linenumber" name="59" href="#59">59</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The default number of pages to keep in memory */</em>
<a class="jxr_linenumber" name="60" href="#60">60</a>      <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_CACHE_SIZE = 1000;
<a class="jxr_linenumber" name="61" href="#61">61</a>  
<a class="jxr_linenumber" name="62" href="#62">62</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The cache size, default to 1000 elements */</em>
<a class="jxr_linenumber" name="63" href="#63">63</a>      <strong class="jxr_keyword">protected</strong> <strong class="jxr_keyword">int</strong> cacheSize = DEFAULT_CACHE_SIZE;
<a class="jxr_linenumber" name="64" href="#64">64</a>  
<a class="jxr_linenumber" name="65" href="#65">65</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A flag indicating if this <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> is a Sub <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> */</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">boolean</strong> isSubBtree = false;
<a class="jxr_linenumber" name="67" href="#67">67</a>  
<a class="jxr_linenumber" name="68" href="#68">68</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The number of stored Values before we switch to a <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> */</em>
<a class="jxr_linenumber" name="69" href="#69">69</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_VALUE_THRESHOLD_UP = 8;
<a class="jxr_linenumber" name="70" href="#70">70</a>  
<a class="jxr_linenumber" name="71" href="#71">71</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The number of stored Values before we switch back to an array */</em>
<a class="jxr_linenumber" name="72" href="#72">72</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">int</strong> DEFAULT_VALUE_THRESHOLD_LOW = 1;
<a class="jxr_linenumber" name="73" href="#73">73</a>  
<a class="jxr_linenumber" name="74" href="#74">74</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The configuration for the array &lt;-&gt; <a href="../../../../../org/apache/directory/mavibot/btree/BTree.html">BTree</a> switch */</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>      <em class="jxr_comment">/*<em class="jxr_comment">No qualifier*/</em><strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> valueThresholdUp = DEFAULT_VALUE_THRESHOLD_UP;</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>      <em class="jxr_comment">/*<em class="jxr_comment">No qualifier*/</em><strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">int</strong> valueThresholdLow = DEFAULT_VALUE_THRESHOLD_LOW;</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>  
<a class="jxr_linenumber" name="78" href="#78">78</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> A lock to protect the creation of the transaction */</em>
<a class="jxr_linenumber" name="79" href="#79">79</a>      <strong class="jxr_keyword">protected</strong> ReentrantLock createTransaction = <strong class="jxr_keyword">new</strong> ReentrantLock();
<a class="jxr_linenumber" name="80" href="#80">80</a>  
<a class="jxr_linenumber" name="81" href="#81">81</a>  
<a class="jxr_linenumber" name="82" href="#82">82</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="83" href="#83">83</a>  <em class="jxr_javadoccomment">     * Creates a new BTree, with no initialization.</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="85" href="#85">85</a>      <em class="jxr_comment">/*<em class="jxr_comment"> no qualifier */</em><a href="../../../../../org/apache/directory/mavibot/btree/PersistedBTree.html">PersistedBTree</a>()</em>
<a class="jxr_linenumber" name="86" href="#86">86</a>      {
<a class="jxr_linenumber" name="87" href="#87">87</a>          btreeHeader = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/directory/mavibot/btree/BTreeHeader.html">BTreeHeader</a>();
<a class="jxr_linenumber" name="88" href="#88">88</a>          setType( BTreeTypeEnum.PERSISTED );
<a class="jxr_linenumber" name="89" href="#89">89</a>      }
<a class="jxr_linenumber" name="90" href="#90">90</a>  
<a class="jxr_linenumber" name="91" href="#91">91</a>  
<a class="jxr_linenumber" name="92" href="#92">92</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="93" href="#93">93</a>  <em class="jxr_javadoccomment">     * Creates a new persisted BTree using the BTreeConfiguration to initialize the</em>
<a class="jxr_linenumber" name="94" href="#94">94</a>  <em class="jxr_javadoccomment">     * BTree</em>
<a class="jxr_linenumber" name="95" href="#95">95</a>  <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="96" href="#96">96</a>  <em class="jxr_javadoccomment">     * @param configuration The configuration to use</em>
<a class="jxr_linenumber" name="97" href="#97">97</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="98" href="#98">98</a>      <em class="jxr_comment">/*<em class="jxr_comment"> no qualifier */</em><a href="../../../../../org/apache/directory/mavibot/btree/PersistedBTree.html">PersistedBTree</a>( PersistedBTreeConfiguration&lt;K, V&gt; configuration )</em>
<a class="jxr_linenumber" name="99" href="#99">99</a>      {
<a class="jxr_linenumber" name="100" href="#100">100</a>         <strong class="jxr_keyword">super</strong>();
<a class="jxr_linenumber" name="101" href="#101">101</a>         String name = configuration.getName();
<a class="jxr_linenumber" name="102" href="#102">102</a> 
<a class="jxr_linenumber" name="103" href="#103">103</a>         <strong class="jxr_keyword">if</strong> ( name == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="104" href="#104">104</a>         {
<a class="jxr_linenumber" name="105" href="#105">105</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException( <span class="jxr_string">"BTree name cannot be null"</span> );
<a class="jxr_linenumber" name="106" href="#106">106</a>         }
<a class="jxr_linenumber" name="107" href="#107">107</a> 
<a class="jxr_linenumber" name="108" href="#108">108</a>         btreeHeader = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/directory/mavibot/btree/BTreeHeader.html">BTreeHeader</a>();
<a class="jxr_linenumber" name="109" href="#109">109</a>         btreeHeader.setName( name );
<a class="jxr_linenumber" name="110" href="#110">110</a>         btreeHeader.setPageSize( configuration.getPageSize() );
<a class="jxr_linenumber" name="111" href="#111">111</a>         isSubBtree = configuration.isSubBtree();
<a class="jxr_linenumber" name="112" href="#112">112</a> 
<a class="jxr_linenumber" name="113" href="#113">113</a>         keySerializer = configuration.getKeySerializer();
<a class="jxr_linenumber" name="114" href="#114">114</a>         btreeHeader.setKeySerializerFQCN( keySerializer.getClass().getName() );
<a class="jxr_linenumber" name="115" href="#115">115</a> 
<a class="jxr_linenumber" name="116" href="#116">116</a>         valueSerializer = configuration.getValueSerializer();
<a class="jxr_linenumber" name="117" href="#117">117</a>         btreeHeader.setValueSerializerFQCN( valueSerializer.getClass().getName() );
<a class="jxr_linenumber" name="118" href="#118">118</a> 
<a class="jxr_linenumber" name="119" href="#119">119</a>         readTimeOut = configuration.getReadTimeOut();
<a class="jxr_linenumber" name="120" href="#120">120</a>         writeBufferSize = configuration.getWriteBufferSize();
<a class="jxr_linenumber" name="121" href="#121">121</a>         btreeHeader.setAllowDuplicates( configuration.isAllowDuplicates() );
<a class="jxr_linenumber" name="122" href="#122">122</a>         cacheSize = configuration.getCacheSize();
<a class="jxr_linenumber" name="123" href="#123">123</a>         setType( BTreeTypeEnum.PERSISTED );
<a class="jxr_linenumber" name="124" href="#124">124</a> 
<a class="jxr_linenumber" name="125" href="#125">125</a>         <strong class="jxr_keyword">if</strong> ( keySerializer.getComparator() == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="126" href="#126">126</a>         {
<a class="jxr_linenumber" name="127" href="#127">127</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException( <span class="jxr_string">"Comparator should not be null"</span> );
<a class="jxr_linenumber" name="128" href="#128">128</a>         }
<a class="jxr_linenumber" name="129" href="#129">129</a> 
<a class="jxr_linenumber" name="130" href="#130">130</a>         <em class="jxr_comment">// Create the first root page, with revision 0L. It will be empty</em>
<a class="jxr_linenumber" name="131" href="#131">131</a>         <em class="jxr_comment">// and increment the revision at the same time</em>
<a class="jxr_linenumber" name="132" href="#132">132</a>         rootPage = <strong class="jxr_keyword">new</strong> PersistedLeaf&lt;K, V&gt;( <strong class="jxr_keyword">this</strong> );
<a class="jxr_linenumber" name="133" href="#133">133</a> 
<a class="jxr_linenumber" name="134" href="#134">134</a>         <strong class="jxr_keyword">if</strong> ( isSubBtree )
<a class="jxr_linenumber" name="135" href="#135">135</a>         {
<a class="jxr_linenumber" name="136" href="#136">136</a>             <em class="jxr_comment">// The subBTree inherit its cache from its parent BTree</em>
<a class="jxr_linenumber" name="137" href="#137">137</a>             <strong class="jxr_keyword">this</strong>.cache = ( ( PersistedBTree&lt;K, V&gt; ) configuration.getParentBTree() ).getCache();
<a class="jxr_linenumber" name="138" href="#138">138</a>             <strong class="jxr_keyword">this</strong>.writeLock = ( ( PersistedBTree&lt;K, V&gt; ) configuration.getParentBTree() ).getWriteLock();
<a class="jxr_linenumber" name="139" href="#139">139</a>             readTransactions = <strong class="jxr_keyword">new</strong> ConcurrentLinkedQueue&lt;ReadTransaction&lt;K, V&gt;&gt;();
<a class="jxr_linenumber" name="140" href="#140">140</a>         }
<a class="jxr_linenumber" name="141" href="#141">141</a> 
<a class="jxr_linenumber" name="142" href="#142">142</a>         <em class="jxr_comment">// Now, initialize the BTree</em>
<a class="jxr_linenumber" name="143" href="#143">143</a>         init();
<a class="jxr_linenumber" name="144" href="#144">144</a>     }
<a class="jxr_linenumber" name="145" href="#145">145</a> 
<a class="jxr_linenumber" name="146" href="#146">146</a> 
<a class="jxr_linenumber" name="147" href="#147">147</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="148" href="#148">148</a> <em class="jxr_javadoccomment">     * Initialize the BTree.</em>
<a class="jxr_linenumber" name="149" href="#149">149</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="150" href="#150">150</a> <em class="jxr_javadoccomment">     * @throws IOException If we get some exception while initializing the BTree</em>
<a class="jxr_linenumber" name="151" href="#151">151</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="152" href="#152">152</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> init()
<a class="jxr_linenumber" name="153" href="#153">153</a>     {
<a class="jxr_linenumber" name="154" href="#154">154</a>         <strong class="jxr_keyword">if</strong> ( !isSubBtree )
<a class="jxr_linenumber" name="155" href="#155">155</a>         {
<a class="jxr_linenumber" name="156" href="#156">156</a>             <em class="jxr_comment">// This is not a subBtree, we have to initialize the cache</em>
<a class="jxr_linenumber" name="157" href="#157">157</a> 
<a class="jxr_linenumber" name="158" href="#158">158</a>             <em class="jxr_comment">// Create the queue containing the pending read transactions</em>
<a class="jxr_linenumber" name="159" href="#159">159</a>             readTransactions = <strong class="jxr_keyword">new</strong> ConcurrentLinkedQueue&lt;ReadTransaction&lt;K, V&gt;&gt;();
<a class="jxr_linenumber" name="160" href="#160">160</a> 
<a class="jxr_linenumber" name="161" href="#161">161</a>             writeLock = <strong class="jxr_keyword">new</strong> ReentrantLock();
<a class="jxr_linenumber" name="162" href="#162">162</a> 
<a class="jxr_linenumber" name="163" href="#163">163</a>             <em class="jxr_comment">// Initialize the caches</em>
<a class="jxr_linenumber" name="164" href="#164">164</a>             CacheConfiguration cacheConfiguration = <strong class="jxr_keyword">new</strong> CacheConfiguration();
<a class="jxr_linenumber" name="165" href="#165">165</a>             cacheConfiguration.setName( <span class="jxr_string">"pages"</span> );
<a class="jxr_linenumber" name="166" href="#166">166</a>             cacheConfiguration.setEternal( <strong class="jxr_keyword">true</strong> );
<a class="jxr_linenumber" name="167" href="#167">167</a>             cacheConfiguration.setOverflowToDisk( false );
<a class="jxr_linenumber" name="168" href="#168">168</a>             cacheConfiguration.setCacheLoaderTimeoutMillis( 0 );
<a class="jxr_linenumber" name="169" href="#169">169</a>             cacheConfiguration.setMaxElementsInMemory( cacheSize );
<a class="jxr_linenumber" name="170" href="#170">170</a>             cacheConfiguration.setMemoryStoreEvictionPolicy( <span class="jxr_string">"LRU"</span> );
<a class="jxr_linenumber" name="171" href="#171">171</a> 
<a class="jxr_linenumber" name="172" href="#172">172</a>             cache = <strong class="jxr_keyword">new</strong> Cache( cacheConfiguration );
<a class="jxr_linenumber" name="173" href="#173">173</a>             cache.initialise();
<a class="jxr_linenumber" name="174" href="#174">174</a>         }
<a class="jxr_linenumber" name="175" href="#175">175</a> 
<a class="jxr_linenumber" name="176" href="#176">176</a>         <em class="jxr_comment">// Initialize the txnManager thread</em>
<a class="jxr_linenumber" name="177" href="#177">177</a>         <em class="jxr_comment">//FIXME we should NOT create a new transaction manager thread for each BTree</em>
<a class="jxr_linenumber" name="178" href="#178">178</a>         <em class="jxr_comment">//createTransactionManager();</em>
<a class="jxr_linenumber" name="179" href="#179">179</a>     }
<a class="jxr_linenumber" name="180" href="#180">180</a> 
<a class="jxr_linenumber" name="181" href="#181">181</a> 
<a class="jxr_linenumber" name="182" href="#182">182</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="183" href="#183">183</a> <em class="jxr_javadoccomment">     * Return the cache we use in this BTree</em>
<a class="jxr_linenumber" name="184" href="#184">184</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="185" href="#185">185</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier */</em>Cache getCache()</em>
<a class="jxr_linenumber" name="186" href="#186">186</a>     {
<a class="jxr_linenumber" name="187" href="#187">187</a>         <strong class="jxr_keyword">return</strong> cache;
<a class="jxr_linenumber" name="188" href="#188">188</a>     }
<a class="jxr_linenumber" name="189" href="#189">189</a> 
<a class="jxr_linenumber" name="190" href="#190">190</a> 
<a class="jxr_linenumber" name="191" href="#191">191</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="192" href="#192">192</a> <em class="jxr_javadoccomment">     * Return the cache we use in this BTree</em>
<a class="jxr_linenumber" name="193" href="#193">193</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="194" href="#194">194</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier */</em>ReentrantLock getWriteLock()</em>
<a class="jxr_linenumber" name="195" href="#195">195</a>     {
<a class="jxr_linenumber" name="196" href="#196">196</a>         <strong class="jxr_keyword">return</strong> writeLock;
<a class="jxr_linenumber" name="197" href="#197">197</a>     }
<a class="jxr_linenumber" name="198" href="#198">198</a> 
<a class="jxr_linenumber" name="199" href="#199">199</a> 
<a class="jxr_linenumber" name="200" href="#200">200</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="201" href="#201">201</a> <em class="jxr_javadoccomment">     * Return the cache we use in this BTree</em>
<a class="jxr_linenumber" name="202" href="#202">202</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="203" href="#203">203</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier */</em>ConcurrentLinkedQueue&lt;ReadTransaction&lt;K, V&gt;&gt; getReadTransactions()</em>
<a class="jxr_linenumber" name="204" href="#204">204</a>     {
<a class="jxr_linenumber" name="205" href="#205">205</a>         <strong class="jxr_keyword">return</strong> readTransactions;
<a class="jxr_linenumber" name="206" href="#206">206</a>     }
<a class="jxr_linenumber" name="207" href="#207">207</a> 
<a class="jxr_linenumber" name="208" href="#208">208</a> 
<a class="jxr_linenumber" name="209" href="#209">209</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="210" href="#210">210</a> <em class="jxr_javadoccomment">     * Close the BTree, cleaning up all the data structure</em>
<a class="jxr_linenumber" name="211" href="#211">211</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="212" href="#212">212</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> close() <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="213" href="#213">213</a>     {
<a class="jxr_linenumber" name="214" href="#214">214</a>         <em class="jxr_comment">// Stop the readTransaction thread</em>
<a class="jxr_linenumber" name="215" href="#215">215</a>         <em class="jxr_comment">// readTransactionsThread.interrupt();</em>
<a class="jxr_linenumber" name="216" href="#216">216</a>         <em class="jxr_comment">// readTransactions.clear();</em>
<a class="jxr_linenumber" name="217" href="#217">217</a> 
<a class="jxr_linenumber" name="218" href="#218">218</a>         <em class="jxr_comment">// Clean the cache</em>
<a class="jxr_linenumber" name="219" href="#219">219</a>         <strong class="jxr_keyword">if</strong> ( cache.getStatus() == Status.STATUS_ALIVE )
<a class="jxr_linenumber" name="220" href="#220">220</a>         {
<a class="jxr_linenumber" name="221" href="#221">221</a>             cache.removeAll();
<a class="jxr_linenumber" name="222" href="#222">222</a>         }
<a class="jxr_linenumber" name="223" href="#223">223</a> 
<a class="jxr_linenumber" name="224" href="#224">224</a>         cache.dispose();
<a class="jxr_linenumber" name="225" href="#225">225</a> 
<a class="jxr_linenumber" name="226" href="#226">226</a>         rootPage = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="227" href="#227">227</a>     }
<a class="jxr_linenumber" name="228" href="#228">228</a> 
<a class="jxr_linenumber" name="229" href="#229">229</a> 
<a class="jxr_linenumber" name="230" href="#230">230</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="231" href="#231">231</a> <em class="jxr_javadoccomment">     * @return the btreeOffset</em>
<a class="jxr_linenumber" name="232" href="#232">232</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="233" href="#233">233</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">long</strong> getBtreeOffset()</em>
<a class="jxr_linenumber" name="234" href="#234">234</a>     {
<a class="jxr_linenumber" name="235" href="#235">235</a>         <strong class="jxr_keyword">return</strong> btreeHeader.getBTreeOffset();
<a class="jxr_linenumber" name="236" href="#236">236</a>     }
<a class="jxr_linenumber" name="237" href="#237">237</a> 
<a class="jxr_linenumber" name="238" href="#238">238</a> 
<a class="jxr_linenumber" name="239" href="#239">239</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="240" href="#240">240</a> <em class="jxr_javadoccomment">     * @param btreeOffset the btreeOffset to set</em>
<a class="jxr_linenumber" name="241" href="#241">241</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="242" href="#242">242</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">void</strong> setBtreeOffset( <strong class="jxr_keyword">long</strong> btreeOffset )</em>
<a class="jxr_linenumber" name="243" href="#243">243</a>     {
<a class="jxr_linenumber" name="244" href="#244">244</a>         btreeHeader.setBTreeOffset( btreeOffset );
<a class="jxr_linenumber" name="245" href="#245">245</a>     }
<a class="jxr_linenumber" name="246" href="#246">246</a> 
<a class="jxr_linenumber" name="247" href="#247">247</a> 
<a class="jxr_linenumber" name="248" href="#248">248</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="249" href="#249">249</a> <em class="jxr_javadoccomment">     * @return the rootPageOffset</em>
<a class="jxr_linenumber" name="250" href="#250">250</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="251" href="#251">251</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">long</strong> getRootPageOffset()</em>
<a class="jxr_linenumber" name="252" href="#252">252</a>     {
<a class="jxr_linenumber" name="253" href="#253">253</a>         <strong class="jxr_keyword">return</strong> btreeHeader.getRootPageOffset();
<a class="jxr_linenumber" name="254" href="#254">254</a>     }
<a class="jxr_linenumber" name="255" href="#255">255</a> 
<a class="jxr_linenumber" name="256" href="#256">256</a> 
<a class="jxr_linenumber" name="257" href="#257">257</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="258" href="#258">258</a> <em class="jxr_javadoccomment">     * @param rootPageOffset the rootPageOffset to set</em>
<a class="jxr_linenumber" name="259" href="#259">259</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="260" href="#260">260</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">void</strong> setRootPageOffset( <strong class="jxr_keyword">long</strong> rootPageOffset )</em>
<a class="jxr_linenumber" name="261" href="#261">261</a>     {
<a class="jxr_linenumber" name="262" href="#262">262</a>         btreeHeader.setRootPageOffset( rootPageOffset );
<a class="jxr_linenumber" name="263" href="#263">263</a>     }
<a class="jxr_linenumber" name="264" href="#264">264</a> 
<a class="jxr_linenumber" name="265" href="#265">265</a> 
<a class="jxr_linenumber" name="266" href="#266">266</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="267" href="#267">267</a> <em class="jxr_javadoccomment">     * @return the nextBTreeOffset</em>
<a class="jxr_linenumber" name="268" href="#268">268</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="269" href="#269">269</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">long</strong> getNextBTreeOffset()</em>
<a class="jxr_linenumber" name="270" href="#270">270</a>     {
<a class="jxr_linenumber" name="271" href="#271">271</a>         <strong class="jxr_keyword">return</strong> btreeHeader.getNextBTreeOffset();
<a class="jxr_linenumber" name="272" href="#272">272</a>     }
<a class="jxr_linenumber" name="273" href="#273">273</a> 
<a class="jxr_linenumber" name="274" href="#274">274</a> 
<a class="jxr_linenumber" name="275" href="#275">275</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="276" href="#276">276</a> <em class="jxr_javadoccomment">     * @param nextBTreeOffset the nextBTreeOffset to set</em>
<a class="jxr_linenumber" name="277" href="#277">277</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="278" href="#278">278</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier*/</em><strong class="jxr_keyword">void</strong> setNextBTreeOffset( <strong class="jxr_keyword">long</strong> nextBTreeOffset )</em>
<a class="jxr_linenumber" name="279" href="#279">279</a>     {
<a class="jxr_linenumber" name="280" href="#280">280</a>         btreeHeader.setNextBTreeOffset( nextBTreeOffset );
<a class="jxr_linenumber" name="281" href="#281">281</a>     }
<a class="jxr_linenumber" name="282" href="#282">282</a> 
<a class="jxr_linenumber" name="283" href="#283">283</a> 
<a class="jxr_linenumber" name="284" href="#284">284</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="285" href="#285">285</a> <em class="jxr_javadoccomment">     * Gets the RecordManager for a managed BTree</em>
<a class="jxr_linenumber" name="286" href="#286">286</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="287" href="#287">287</a> <em class="jxr_javadoccomment">     * @return The recordManager if the BTree is managed</em>
<a class="jxr_linenumber" name="288" href="#288">288</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="289" href="#289">289</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier */</em><a href="../../../../../org/apache/directory/mavibot/btree/RecordManager.html">RecordManager</a> getRecordManager()</em>
<a class="jxr_linenumber" name="290" href="#290">290</a>     {
<a class="jxr_linenumber" name="291" href="#291">291</a>         <strong class="jxr_keyword">return</strong> recordManager;
<a class="jxr_linenumber" name="292" href="#292">292</a>     }
<a class="jxr_linenumber" name="293" href="#293">293</a> 
<a class="jxr_linenumber" name="294" href="#294">294</a> 
<a class="jxr_linenumber" name="295" href="#295">295</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="296" href="#296">296</a> <em class="jxr_javadoccomment">     * Inject a RecordManager for a managed BTree</em>
<a class="jxr_linenumber" name="297" href="#297">297</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="298" href="#298">298</a> <em class="jxr_javadoccomment">     * @param recordManager The injected RecordManager</em>
<a class="jxr_linenumber" name="299" href="#299">299</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="300" href="#300">300</a>     <em class="jxr_comment">/*<em class="jxr_comment"> No qualifier */</em><strong class="jxr_keyword">void</strong> setRecordManager( RecordManager recordManager )</em>
<a class="jxr_linenumber" name="301" href="#301">301</a>     {
<a class="jxr_linenumber" name="302" href="#302">302</a>         <strong class="jxr_keyword">this</strong>.recordManager = recordManager;
<a class="jxr_linenumber" name="303" href="#303">303</a>     }
<a class="jxr_linenumber" name="304" href="#304">304</a> 
<a class="jxr_linenumber" name="305" href="#305">305</a> 
<a class="jxr_linenumber" name="306" href="#306">306</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="307" href="#307">307</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="308" href="#308">308</a> <em class="jxr_javadoccomment">     * Deletes the given &lt;key,value&gt; pair if both key and value match. If the given value is null</em>
<a class="jxr_linenumber" name="309" href="#309">309</a> <em class="jxr_javadoccomment">     * and there is no null value associated with the given key then the entry with the given key</em>
<a class="jxr_linenumber" name="310" href="#310">310</a> <em class="jxr_javadoccomment">     * will be removed.</em>
<a class="jxr_linenumber" name="311" href="#311">311</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="312" href="#312">312</a> <em class="jxr_javadoccomment">     * @param key The key to be removed</em>
<a class="jxr_linenumber" name="313" href="#313">313</a> <em class="jxr_javadoccomment">     * @param value The value to be removed (can be null, and when no null value exists the key will be removed irrespective of the value)</em>
<a class="jxr_linenumber" name="314" href="#314">314</a> <em class="jxr_javadoccomment">     * @param revision The revision to be associated with this operation</em>
<a class="jxr_linenumber" name="315" href="#315">315</a> <em class="jxr_javadoccomment">     * @return</em>
<a class="jxr_linenumber" name="316" href="#316">316</a> <em class="jxr_javadoccomment">     * @throws IOException</em>
<a class="jxr_linenumber" name="317" href="#317">317</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="318" href="#318">318</a>     <strong class="jxr_keyword">protected</strong> Tuple&lt;K, V&gt; delete( K key, V value, <strong class="jxr_keyword">long</strong> revision ) <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="319" href="#319">319</a>     {
<a class="jxr_linenumber" name="320" href="#320">320</a>         writeLock.lock();
<a class="jxr_linenumber" name="321" href="#321">321</a> 
<a class="jxr_linenumber" name="322" href="#322">322</a>         <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="323" href="#323">323</a>         {
<a class="jxr_linenumber" name="324" href="#324">324</a>             <em class="jxr_comment">// If the key exists, the existing value will be replaced. We store it</em>
<a class="jxr_linenumber" name="325" href="#325">325</a>             <em class="jxr_comment">// to return it to the caller.</em>
<a class="jxr_linenumber" name="326" href="#326">326</a>             Tuple&lt;K, V&gt; tuple = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="327" href="#327">327</a> 
<a class="jxr_linenumber" name="328" href="#328">328</a>             <em class="jxr_comment">// Try to delete the entry starting from the root page. Here, the root</em>
<a class="jxr_linenumber" name="329" href="#329">329</a>             <em class="jxr_comment">// page may be either a Node or a Leaf</em>
<a class="jxr_linenumber" name="330" href="#330">330</a>             DeleteResult&lt;K, V&gt; result = rootPage.delete( revision, key, value, <strong class="jxr_keyword">null</strong>, -1 );
<a class="jxr_linenumber" name="331" href="#331">331</a> 
<a class="jxr_linenumber" name="332" href="#332">332</a>             <strong class="jxr_keyword">if</strong> ( result instanceof NotPresentResult )
<a class="jxr_linenumber" name="333" href="#333">333</a>             {
<a class="jxr_linenumber" name="334" href="#334">334</a>                 <em class="jxr_comment">// Key not found.</em>
<a class="jxr_linenumber" name="335" href="#335">335</a>                 <strong class="jxr_keyword">return</strong> <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="336" href="#336">336</a>             }
<a class="jxr_linenumber" name="337" href="#337">337</a> 
<a class="jxr_linenumber" name="338" href="#338">338</a>             <em class="jxr_comment">// Keep the oldRootPage so that we can later access it</em>
<a class="jxr_linenumber" name="339" href="#339">339</a>             Page&lt;K, V&gt; oldRootPage = rootPage;
<a class="jxr_linenumber" name="340" href="#340">340</a> 
<a class="jxr_linenumber" name="341" href="#341">341</a>             <strong class="jxr_keyword">if</strong> ( result instanceof RemoveResult )
<a class="jxr_linenumber" name="342" href="#342">342</a>             {
<a class="jxr_linenumber" name="343" href="#343">343</a>                 <em class="jxr_comment">// The element was found, and removed</em>
<a class="jxr_linenumber" name="344" href="#344">344</a>                 RemoveResult&lt;K, V&gt; removeResult = ( RemoveResult&lt;K, V&gt; ) result;
<a class="jxr_linenumber" name="345" href="#345">345</a> 
<a class="jxr_linenumber" name="346" href="#346">346</a>                 Page&lt;K, V&gt; modifiedPage = removeResult.getModifiedPage();
<a class="jxr_linenumber" name="347" href="#347">347</a> 
<a class="jxr_linenumber" name="348" href="#348">348</a>                 <em class="jxr_comment">// Write the modified page on disk</em>
<a class="jxr_linenumber" name="349" href="#349">349</a>                 <em class="jxr_comment">// Note that we don't use the holder, the new root page will</em>
<a class="jxr_linenumber" name="350" href="#350">350</a>                 <em class="jxr_comment">// remain in memory.</em>
<a class="jxr_linenumber" name="351" href="#351">351</a>                 PageHolder&lt;K, V&gt; holder = writePage( modifiedPage, revision );
<a class="jxr_linenumber" name="352" href="#352">352</a> 
<a class="jxr_linenumber" name="353" href="#353">353</a>                 <em class="jxr_comment">// Store the offset on disk in the page in memory</em>
<a class="jxr_linenumber" name="354" href="#354">354</a>                 ( ( AbstractPage&lt;K, V&gt; ) modifiedPage ).setOffset( ( ( PersistedPageHolder&lt;K, V&gt; ) holder )
<a class="jxr_linenumber" name="355" href="#355">355</a>                     .getOffset() );
<a class="jxr_linenumber" name="356" href="#356">356</a> 
<a class="jxr_linenumber" name="357" href="#357">357</a>                 <em class="jxr_comment">// Store the last offset on disk in the page in memory</em>
<a class="jxr_linenumber" name="358" href="#358">358</a>                 ( ( AbstractPage&lt;K, V&gt; ) modifiedPage )
<a class="jxr_linenumber" name="359" href="#359">359</a>                     .setLastOffset( ( ( PersistedPageHolder&lt;K, V&gt; ) holder )
<a class="jxr_linenumber" name="360" href="#360">360</a>                         .getLastOffset() );
<a class="jxr_linenumber" name="361" href="#361">361</a> 
<a class="jxr_linenumber" name="362" href="#362">362</a>                 <em class="jxr_comment">// This is a new root</em>
<a class="jxr_linenumber" name="363" href="#363">363</a>                 rootPage = modifiedPage;
<a class="jxr_linenumber" name="364" href="#364">364</a>                 tuple = removeResult.getRemovedElement();
<a class="jxr_linenumber" name="365" href="#365">365</a>             }
<a class="jxr_linenumber" name="366" href="#366">366</a> 
<a class="jxr_linenumber" name="367" href="#367">367</a>             <em class="jxr_comment">// Decrease the number of elements in the current tree if the deletion is successful</em>
<a class="jxr_linenumber" name="368" href="#368">368</a>             <strong class="jxr_keyword">if</strong> ( tuple != <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="369" href="#369">369</a>             {
<a class="jxr_linenumber" name="370" href="#370">370</a>                 btreeHeader.decrementNbElems();
<a class="jxr_linenumber" name="371" href="#371">371</a> 
<a class="jxr_linenumber" name="372" href="#372">372</a>                 <em class="jxr_comment">// We have to update the rootPage on disk</em>
<a class="jxr_linenumber" name="373" href="#373">373</a>                 <em class="jxr_comment">// Update the BTree header now</em>
<a class="jxr_linenumber" name="374" href="#374">374</a>                 recordManager.updateBtreeHeader( <strong class="jxr_keyword">this</strong>, ( ( AbstractPage&lt;K, V&gt; ) rootPage ).getOffset() );
<a class="jxr_linenumber" name="375" href="#375">375</a>             }
<a class="jxr_linenumber" name="376" href="#376">376</a> 
<a class="jxr_linenumber" name="377" href="#377">377</a>             recordManager.addFreePages( <strong class="jxr_keyword">this</strong>, result.getCopiedPages() );
<a class="jxr_linenumber" name="378" href="#378">378</a> 
<a class="jxr_linenumber" name="379" href="#379">379</a>             <em class="jxr_comment">// Update the RecordManager header</em>
<a class="jxr_linenumber" name="380" href="#380">380</a>             recordManager.updateRecordManagerHeader();
<a class="jxr_linenumber" name="381" href="#381">381</a> 
<a class="jxr_linenumber" name="382" href="#382">382</a>             <em class="jxr_comment">// Store the created rootPage into the revision BTree, this will be stored in RecordManager only if revisions are set to keep</em>
<a class="jxr_linenumber" name="383" href="#383">383</a>             recordManager.storeRootPage( <strong class="jxr_keyword">this</strong>, rootPage );
<a class="jxr_linenumber" name="384" href="#384">384</a> 
<a class="jxr_linenumber" name="385" href="#385">385</a>             <em class="jxr_comment">// Return the value we have found if it was modified</em>
<a class="jxr_linenumber" name="386" href="#386">386</a>             <strong class="jxr_keyword">return</strong> tuple;
<a class="jxr_linenumber" name="387" href="#387">387</a>         }
<a class="jxr_linenumber" name="388" href="#388">388</a>         <strong class="jxr_keyword">finally</strong>
<a class="jxr_linenumber" name="389" href="#389">389</a>         {
<a class="jxr_linenumber" name="390" href="#390">390</a>             <em class="jxr_comment">// See above</em>
<a class="jxr_linenumber" name="391" href="#391">391</a>             writeLock.unlock();
<a class="jxr_linenumber" name="392" href="#392">392</a>         }
<a class="jxr_linenumber" name="393" href="#393">393</a>     }
<a class="jxr_linenumber" name="394" href="#394">394</a> 
<a class="jxr_linenumber" name="395" href="#395">395</a> 
<a class="jxr_linenumber" name="396" href="#396">396</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="397" href="#397">397</a> <em class="jxr_javadoccomment">     * Insert an entry in the BTree.</em>
<a class="jxr_linenumber" name="398" href="#398">398</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a class="jxr_linenumber" name="399" href="#399">399</a> <em class="jxr_javadoccomment">     * We will replace the value if the provided key already exists in the</em>
<a class="jxr_linenumber" name="400" href="#400">400</a> <em class="jxr_javadoccomment">     * btree.</em>
<a class="jxr_linenumber" name="401" href="#401">401</a> <em class="jxr_javadoccomment">     * &lt;p&gt;</em>
<a class="jxr_linenumber" name="402" href="#402">402</a> <em class="jxr_javadoccomment">     * The revision number is the revision to use to insert the data.</em>
<a class="jxr_linenumber" name="403" href="#403">403</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="404" href="#404">404</a> <em class="jxr_javadoccomment">     * @param key Inserted key</em>
<a class="jxr_linenumber" name="405" href="#405">405</a> <em class="jxr_javadoccomment">     * @param value Inserted value</em>
<a class="jxr_linenumber" name="406" href="#406">406</a> <em class="jxr_javadoccomment">     * @param revision The revision to use</em>
<a class="jxr_linenumber" name="407" href="#407">407</a> <em class="jxr_javadoccomment">     * @return an instance of the InsertResult.</em>
<a class="jxr_linenumber" name="408" href="#408">408</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="409" href="#409">409</a>     <em class="jxr_comment">/*<em class="jxr_comment"> no qualifier */</em>InsertResult&lt;K, V&gt; insert( K key, V value, <strong class="jxr_keyword">long</strong> revision ) <strong class="jxr_keyword">throws</strong> IOException</em>
<a class="jxr_linenumber" name="410" href="#410">410</a>     {
<a class="jxr_linenumber" name="411" href="#411">411</a>         <strong class="jxr_keyword">if</strong> ( key == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="412" href="#412">412</a>         {
<a class="jxr_linenumber" name="413" href="#413">413</a>             <strong class="jxr_keyword">throw</strong> <strong class="jxr_keyword">new</strong> IllegalArgumentException( <span class="jxr_string">"Key must not be null"</span> );
<a class="jxr_linenumber" name="414" href="#414">414</a>         }
<a class="jxr_linenumber" name="415" href="#415">415</a> 
<a class="jxr_linenumber" name="416" href="#416">416</a>         <em class="jxr_comment">// If the key exists, the existing value will be replaced. We store it</em>
<a class="jxr_linenumber" name="417" href="#417">417</a>         <em class="jxr_comment">// to return it to the caller.</em>
<a class="jxr_linenumber" name="418" href="#418">418</a>         V modifiedValue = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="419" href="#419">419</a> 
<a class="jxr_linenumber" name="420" href="#420">420</a>         <em class="jxr_comment">// Try to insert the new value in the tree at the right place,</em>
<a class="jxr_linenumber" name="421" href="#421">421</a>         <em class="jxr_comment">// starting from the root page. Here, the root page may be either</em>
<a class="jxr_linenumber" name="422" href="#422">422</a>         <em class="jxr_comment">// a Node or a Leaf</em>
<a class="jxr_linenumber" name="423" href="#423">423</a>         InsertResult&lt;K, V&gt; result = rootPage.insert( revision, key, value );
<a class="jxr_linenumber" name="424" href="#424">424</a> 
<a class="jxr_linenumber" name="425" href="#425">425</a>         <strong class="jxr_keyword">if</strong> ( result instanceof ModifyResult )
<a class="jxr_linenumber" name="426" href="#426">426</a>         {
<a class="jxr_linenumber" name="427" href="#427">427</a>             ModifyResult&lt;K, V&gt; modifyResult = ( ( ModifyResult&lt;K, V&gt; ) result );
<a class="jxr_linenumber" name="428" href="#428">428</a> 
<a class="jxr_linenumber" name="429" href="#429">429</a>             Page&lt;K, V&gt; modifiedPage = modifyResult.getModifiedPage();
<a class="jxr_linenumber" name="430" href="#430">430</a> 
<a class="jxr_linenumber" name="431" href="#431">431</a>             <em class="jxr_comment">// Write the modified page on disk</em>
<a class="jxr_linenumber" name="432" href="#432">432</a>             <em class="jxr_comment">// Note that we don't use the holder, the new root page will</em>
<a class="jxr_linenumber" name="433" href="#433">433</a>             <em class="jxr_comment">// remain in memory.</em>
<a class="jxr_linenumber" name="434" href="#434">434</a>             writePage( modifiedPage, revision );
<a class="jxr_linenumber" name="435" href="#435">435</a> 
<a class="jxr_linenumber" name="436" href="#436">436</a>             <em class="jxr_comment">// The root has just been modified, we haven't split it</em>
<a class="jxr_linenumber" name="437" href="#437">437</a>             <em class="jxr_comment">// Get it and make it the current root page</em>
<a class="jxr_linenumber" name="438" href="#438">438</a>             rootPage = modifiedPage;
<a class="jxr_linenumber" name="439" href="#439">439</a> 
<a class="jxr_linenumber" name="440" href="#440">440</a>             modifiedValue = modifyResult.getModifiedValue();
<a class="jxr_linenumber" name="441" href="#441">441</a>         }
<a class="jxr_linenumber" name="442" href="#442">442</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="443" href="#443">443</a>         {
<a class="jxr_linenumber" name="444" href="#444">444</a>             <em class="jxr_comment">// We have split the old root, create a new one containing</em>
<a class="jxr_linenumber" name="445" href="#445">445</a>             <em class="jxr_comment">// only the pivotal we got back</em>
<a class="jxr_linenumber" name="446" href="#446">446</a>             SplitResult&lt;K, V&gt; splitResult = ( ( SplitResult&lt;K, V&gt; ) result );
<a class="jxr_linenumber" name="447" href="#447">447</a> 
<a class="jxr_linenumber" name="448" href="#448">448</a>             K pivot = splitResult.getPivot();
<a class="jxr_linenumber" name="449" href="#449">449</a>             Page&lt;K, V&gt; leftPage = splitResult.getLeftPage();
<a class="jxr_linenumber" name="450" href="#450">450</a>             Page&lt;K, V&gt; rightPage = splitResult.getRightPage();
<a class="jxr_linenumber" name="451" href="#451">451</a>             Page&lt;K, V&gt; newRootPage = <strong class="jxr_keyword">null</strong>;
<a class="jxr_linenumber" name="452" href="#452">452</a> 
<a class="jxr_linenumber" name="453" href="#453">453</a>             <em class="jxr_comment">// If the BTree is managed, we have to write the two pages that were created</em>
<a class="jxr_linenumber" name="454" href="#454">454</a>             <em class="jxr_comment">// and to keep a track of the two offsets for the upper node</em>
<a class="jxr_linenumber" name="455" href="#455">455</a>             PageHolder&lt;K, V&gt; holderLeft = writePage( leftPage, revision );
<a class="jxr_linenumber" name="456" href="#456">456</a> 
<a class="jxr_linenumber" name="457" href="#457">457</a>             PageHolder&lt;K, V&gt; holderRight = writePage( rightPage, revision );
<a class="jxr_linenumber" name="458" href="#458">458</a> 
<a class="jxr_linenumber" name="459" href="#459">459</a>             <em class="jxr_comment">// Create the new rootPage</em>
<a class="jxr_linenumber" name="460" href="#460">460</a>             newRootPage = <strong class="jxr_keyword">new</strong> PersistedNode&lt;K, V&gt;( <strong class="jxr_keyword">this</strong>, revision, pivot, holderLeft, holderRight );
<a class="jxr_linenumber" name="461" href="#461">461</a> 
<a class="jxr_linenumber" name="462" href="#462">462</a>             <em class="jxr_comment">// If the BTree is managed, we now have to write the page on disk</em>
<a class="jxr_linenumber" name="463" href="#463">463</a>             <em class="jxr_comment">// and to add this page to the list of modified pages</em>
<a class="jxr_linenumber" name="464" href="#464">464</a>             PageHolder&lt;K, V&gt; holder = writePage( newRootPage, revision );
<a class="jxr_linenumber" name="465" href="#465">465</a> 
<a class="jxr_linenumber" name="466" href="#466">466</a>             rootPage = newRootPage;
<a class="jxr_linenumber" name="467" href="#467">467</a>         }
<a class="jxr_linenumber" name="468" href="#468">468</a> 
<a class="jxr_linenumber" name="469" href="#469">469</a>         <em class="jxr_comment">// Increase the number of element in the current tree if the insertion is successful</em>
<a class="jxr_linenumber" name="470" href="#470">470</a>         <em class="jxr_comment">// and does not replace an element</em>
<a class="jxr_linenumber" name="471" href="#471">471</a>         <strong class="jxr_keyword">if</strong> ( modifiedValue == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="472" href="#472">472</a>         {
<a class="jxr_linenumber" name="473" href="#473">473</a>             btreeHeader.incrementNbElems();
<a class="jxr_linenumber" name="474" href="#474">474</a>         }
<a class="jxr_linenumber" name="475" href="#475">475</a> 
<a class="jxr_linenumber" name="476" href="#476">476</a>         <em class="jxr_comment">// If the BTree is managed, we have to update the rootPage on disk</em>
<a class="jxr_linenumber" name="477" href="#477">477</a>         <em class="jxr_comment">// Update the RecordManager header</em>
<a class="jxr_linenumber" name="478" href="#478">478</a>         <strong class="jxr_keyword">if</strong> ( ( writeTransaction == <strong class="jxr_keyword">null</strong> ) || !writeTransaction.isStarted() )
<a class="jxr_linenumber" name="479" href="#479">479</a>         {
<a class="jxr_linenumber" name="480" href="#480">480</a>             recordManager.updateRecordManagerHeader();
<a class="jxr_linenumber" name="481" href="#481">481</a> 
<a class="jxr_linenumber" name="482" href="#482">482</a>             <em class="jxr_comment">// Update the BTree header now</em>
<a class="jxr_linenumber" name="483" href="#483">483</a>             recordManager.updateBtreeHeader( <strong class="jxr_keyword">this</strong>, ( ( AbstractPage&lt;K, V&gt; ) rootPage ).getOffset() );
<a class="jxr_linenumber" name="484" href="#484">484</a> 
<a class="jxr_linenumber" name="485" href="#485">485</a>             <em class="jxr_comment">// Moved the free pages into the list of free pages</em>
<a class="jxr_linenumber" name="486" href="#486">486</a>             recordManager.addFreePages( <strong class="jxr_keyword">this</strong>, result.getCopiedPages() );
<a class="jxr_linenumber" name="487" href="#487">487</a> 
<a class="jxr_linenumber" name="488" href="#488">488</a>             <em class="jxr_comment">// Store the created rootPage into the revision BTree, this will be stored in RecordManager only if revisions are set to keep</em>
<a class="jxr_linenumber" name="489" href="#489">489</a>             recordManager.storeRootPage( <strong class="jxr_keyword">this</strong>, rootPage );
<a class="jxr_linenumber" name="490" href="#490">490</a>         }
<a class="jxr_linenumber" name="491" href="#491">491</a> 
<a class="jxr_linenumber" name="492" href="#492">492</a>         <em class="jxr_comment">// Return the value we have found if it was modified</em>
<a class="jxr_linenumber" name="493" href="#493">493</a>         <strong class="jxr_keyword">return</strong> result;
<a class="jxr_linenumber" name="494" href="#494">494</a>     }
<a class="jxr_linenumber" name="495" href="#495">495</a> 
<a class="jxr_linenumber" name="496" href="#496">496</a> 
<a class="jxr_linenumber" name="497" href="#497">497</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="498" href="#498">498</a> <em class="jxr_javadoccomment">     * Write the data in the ByteBuffer, and eventually on disk if needed.</em>
<a class="jxr_linenumber" name="499" href="#499">499</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="500" href="#500">500</a> <em class="jxr_javadoccomment">     * @param channel The channel we want to write to</em>
<a class="jxr_linenumber" name="501" href="#501">501</a> <em class="jxr_javadoccomment">     * @param bb The ByteBuffer we want to feed</em>
<a class="jxr_linenumber" name="502" href="#502">502</a> <em class="jxr_javadoccomment">     * @param buffer The data to inject</em>
<a class="jxr_linenumber" name="503" href="#503">503</a> <em class="jxr_javadoccomment">     * @throws IOException If the write failed</em>
<a class="jxr_linenumber" name="504" href="#504">504</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="505" href="#505">505</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> writeBuffer( FileChannel channel, ByteBuffer bb, byte[] buffer ) <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="506" href="#506">506</a>     {
<a class="jxr_linenumber" name="507" href="#507">507</a>         <strong class="jxr_keyword">int</strong> size = buffer.length;
<a class="jxr_linenumber" name="508" href="#508">508</a>         <strong class="jxr_keyword">int</strong> pos = 0;
<a class="jxr_linenumber" name="509" href="#509">509</a> 
<a class="jxr_linenumber" name="510" href="#510">510</a>         <em class="jxr_comment">// Loop until we have written all the data</em>
<a class="jxr_linenumber" name="511" href="#511">511</a>         <strong class="jxr_keyword">do</strong>
<a class="jxr_linenumber" name="512" href="#512">512</a>         {
<a class="jxr_linenumber" name="513" href="#513">513</a>             <strong class="jxr_keyword">if</strong> ( bb.remaining() &gt;= size )
<a class="jxr_linenumber" name="514" href="#514">514</a>             {
<a class="jxr_linenumber" name="515" href="#515">515</a>                 <em class="jxr_comment">// No flush, as the ByteBuffer is big enough</em>
<a class="jxr_linenumber" name="516" href="#516">516</a>                 bb.put( buffer, pos, size );
<a class="jxr_linenumber" name="517" href="#517">517</a>                 size = 0;
<a class="jxr_linenumber" name="518" href="#518">518</a>             }
<a class="jxr_linenumber" name="519" href="#519">519</a>             <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="520" href="#520">520</a>             {
<a class="jxr_linenumber" name="521" href="#521">521</a>                 <em class="jxr_comment">// Flush the data on disk, reinitialize the ByteBuffer</em>
<a class="jxr_linenumber" name="522" href="#522">522</a>                 <strong class="jxr_keyword">int</strong> len = bb.remaining();
<a class="jxr_linenumber" name="523" href="#523">523</a>                 size -= len;
<a class="jxr_linenumber" name="524" href="#524">524</a>                 bb.put( buffer, pos, len );
<a class="jxr_linenumber" name="525" href="#525">525</a>                 pos += len;
<a class="jxr_linenumber" name="526" href="#526">526</a> 
<a class="jxr_linenumber" name="527" href="#527">527</a>                 bb.flip();
<a class="jxr_linenumber" name="528" href="#528">528</a> 
<a class="jxr_linenumber" name="529" href="#529">529</a>                 channel.write( bb );
<a class="jxr_linenumber" name="530" href="#530">530</a> 
<a class="jxr_linenumber" name="531" href="#531">531</a>                 bb.clear();
<a class="jxr_linenumber" name="532" href="#532">532</a>             }
<a class="jxr_linenumber" name="533" href="#533">533</a>         }
<a class="jxr_linenumber" name="534" href="#534">534</a>         <strong class="jxr_keyword">while</strong> ( size &gt; 0 );
<a class="jxr_linenumber" name="535" href="#535">535</a>     }
<a class="jxr_linenumber" name="536" href="#536">536</a> 
<a class="jxr_linenumber" name="537" href="#537">537</a> 
<a class="jxr_linenumber" name="538" href="#538">538</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="539" href="#539">539</a> <em class="jxr_javadoccomment">     * Write a page either in the pending pages if the transaction is started,</em>
<a class="jxr_linenumber" name="540" href="#540">540</a> <em class="jxr_javadoccomment">     * or directly on disk.</em>
<a class="jxr_linenumber" name="541" href="#541">541</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="542" href="#542">542</a>     <strong class="jxr_keyword">private</strong> PageHolder&lt;K, V&gt; writePage( Page&lt;K, V&gt; modifiedPage, <strong class="jxr_keyword">long</strong> revision ) <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="543" href="#543">543</a>     {
<a class="jxr_linenumber" name="544" href="#544">544</a>         <strong class="jxr_keyword">if</strong> ( ( writeTransaction != <strong class="jxr_keyword">null</strong> ) &amp;&amp; writeTransaction.isStarted() )
<a class="jxr_linenumber" name="545" href="#545">545</a>         {
<a class="jxr_linenumber" name="546" href="#546">546</a>             Map&lt;Page&lt;?, ?&gt;, BTree&lt;?, ?&gt;&gt; pendingPages = recordManager.getPendingPages();
<a class="jxr_linenumber" name="547" href="#547">547</a>             pendingPages.put( modifiedPage, <strong class="jxr_keyword">this</strong> );
<a class="jxr_linenumber" name="548" href="#548">548</a> 
<a class="jxr_linenumber" name="549" href="#549">549</a>             PageHolder&lt;K, V&gt; pageHolder = <strong class="jxr_keyword">new</strong> PageHolder&lt;K, V&gt;( <strong class="jxr_keyword">this</strong>, modifiedPage );
<a class="jxr_linenumber" name="550" href="#550">550</a> 
<a class="jxr_linenumber" name="551" href="#551">551</a>             <strong class="jxr_keyword">return</strong> pageHolder;
<a class="jxr_linenumber" name="552" href="#552">552</a>         }
<a class="jxr_linenumber" name="553" href="#553">553</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="554" href="#554">554</a>         {
<a class="jxr_linenumber" name="555" href="#555">555</a>             PageHolder&lt;K, V&gt; pageHolder = recordManager.writePage( <strong class="jxr_keyword">this</strong>, modifiedPage, revision );
<a class="jxr_linenumber" name="556" href="#556">556</a> 
<a class="jxr_linenumber" name="557" href="#557">557</a>             <strong class="jxr_keyword">return</strong> pageHolder;
<a class="jxr_linenumber" name="558" href="#558">558</a>         }
<a class="jxr_linenumber" name="559" href="#559">559</a>     }
<a class="jxr_linenumber" name="560" href="#560">560</a> 
<a class="jxr_linenumber" name="561" href="#561">561</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="562" href="#562">562</a> <em class="jxr_javadoccomment">     * Get the rootPzge associated to a give revision.</em>
<a class="jxr_linenumber" name="563" href="#563">563</a> <em class="jxr_javadoccomment">     *</em>
<a class="jxr_linenumber" name="564" href="#564">564</a> <em class="jxr_javadoccomment">     * @param revision The revision we are looking for</em>
<a class="jxr_linenumber" name="565" href="#565">565</a> <em class="jxr_javadoccomment">     * @return The rootPage associated to this revision</em>
<a class="jxr_linenumber" name="566" href="#566">566</a> <em class="jxr_javadoccomment">     * @throws IOException If we had an issue while accessing the underlying file</em>
<a class="jxr_linenumber" name="567" href="#567">567</a> <em class="jxr_javadoccomment">     * @throws KeyNotFoundException If the revision does not exist for this Btree</em>
<a class="jxr_linenumber" name="568" href="#568">568</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="569" href="#569">569</a>     <strong class="jxr_keyword">public</strong> Page&lt;K, V&gt; getRootPage( <strong class="jxr_keyword">long</strong> revision ) <strong class="jxr_keyword">throws</strong> IOException, KeyNotFoundException
<a class="jxr_linenumber" name="570" href="#570">570</a>     {
<a class="jxr_linenumber" name="571" href="#571">571</a>         <strong class="jxr_keyword">return</strong> recordManager.getRootPage( <strong class="jxr_keyword">this</strong>, revision );
<a class="jxr_linenumber" name="572" href="#572">572</a>     }
<a class="jxr_linenumber" name="573" href="#573">573</a> 
<a class="jxr_linenumber" name="574" href="#574">574</a> 
<a class="jxr_linenumber" name="575" href="#575">575</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="576" href="#576">576</a> <em class="jxr_javadoccomment">     * Starts a transaction</em>
<a class="jxr_linenumber" name="577" href="#577">577</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="578" href="#578">578</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> beginTransaction()
<a class="jxr_linenumber" name="579" href="#579">579</a>     {
<a class="jxr_linenumber" name="580" href="#580">580</a>         createTransaction.lock();
<a class="jxr_linenumber" name="581" href="#581">581</a> 
<a class="jxr_linenumber" name="582" href="#582">582</a>         <strong class="jxr_keyword">if</strong> ( writeTransaction == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="583" href="#583">583</a>         {
<a class="jxr_linenumber" name="584" href="#584">584</a>             writeTransaction = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/directory/mavibot/btree/WriteTransaction.html">WriteTransaction</a>( recordManager );
<a class="jxr_linenumber" name="585" href="#585">585</a>         }
<a class="jxr_linenumber" name="586" href="#586">586</a> 
<a class="jxr_linenumber" name="587" href="#587">587</a>         createTransaction.unlock();
<a class="jxr_linenumber" name="588" href="#588">588</a> 
<a class="jxr_linenumber" name="589" href="#589">589</a>         writeTransaction.start();
<a class="jxr_linenumber" name="590" href="#590">590</a>     }
<a class="jxr_linenumber" name="591" href="#591">591</a> 
<a class="jxr_linenumber" name="592" href="#592">592</a> 
<a class="jxr_linenumber" name="593" href="#593">593</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="594" href="#594">594</a> <em class="jxr_javadoccomment">     * Commits a transaction</em>
<a class="jxr_linenumber" name="595" href="#595">595</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="596" href="#596">596</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> commit()
<a class="jxr_linenumber" name="597" href="#597">597</a>     {
<a class="jxr_linenumber" name="598" href="#598">598</a>         createTransaction.lock();
<a class="jxr_linenumber" name="599" href="#599">599</a> 
<a class="jxr_linenumber" name="600" href="#600">600</a>         <strong class="jxr_keyword">if</strong> ( writeTransaction == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="601" href="#601">601</a>         {
<a class="jxr_linenumber" name="602" href="#602">602</a>             writeTransaction = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/directory/mavibot/btree/WriteTransaction.html">WriteTransaction</a>( recordManager );
<a class="jxr_linenumber" name="603" href="#603">603</a>         }
<a class="jxr_linenumber" name="604" href="#604">604</a> 
<a class="jxr_linenumber" name="605" href="#605">605</a>         createTransaction.unlock();
<a class="jxr_linenumber" name="606" href="#606">606</a> 
<a class="jxr_linenumber" name="607" href="#607">607</a>         writeTransaction.commit();
<a class="jxr_linenumber" name="608" href="#608">608</a>     }
<a class="jxr_linenumber" name="609" href="#609">609</a> 
<a class="jxr_linenumber" name="610" href="#610">610</a> 
<a class="jxr_linenumber" name="611" href="#611">611</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="612" href="#612">612</a> <em class="jxr_javadoccomment">     * Rollback a transaction</em>
<a class="jxr_linenumber" name="613" href="#613">613</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="614" href="#614">614</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> rollback()
<a class="jxr_linenumber" name="615" href="#615">615</a>     {
<a class="jxr_linenumber" name="616" href="#616">616</a>         createTransaction.lock();
<a class="jxr_linenumber" name="617" href="#617">617</a> 
<a class="jxr_linenumber" name="618" href="#618">618</a>         <strong class="jxr_keyword">if</strong> ( writeTransaction == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="619" href="#619">619</a>         {
<a class="jxr_linenumber" name="620" href="#620">620</a>             writeTransaction = <strong class="jxr_keyword">new</strong> <a href="../../../../../org/apache/directory/mavibot/btree/WriteTransaction.html">WriteTransaction</a>( recordManager );
<a class="jxr_linenumber" name="621" href="#621">621</a>         }
<a class="jxr_linenumber" name="622" href="#622">622</a> 
<a class="jxr_linenumber" name="623" href="#623">623</a>         createTransaction.unlock();
<a class="jxr_linenumber" name="624" href="#624">624</a> 
<a class="jxr_linenumber" name="625" href="#625">625</a>         writeTransaction.rollback();
<a class="jxr_linenumber" name="626" href="#626">626</a>     }
<a class="jxr_linenumber" name="627" href="#627">627</a> 
<a class="jxr_linenumber" name="628" href="#628">628</a> 
<a class="jxr_linenumber" name="629" href="#629">629</a> 
<a class="jxr_linenumber" name="630" href="#630">630</a> 
<a class="jxr_linenumber" name="631" href="#631">631</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="632" href="#632">632</a> <em class="jxr_javadoccomment">     * @see Object#toString()</em>
<a class="jxr_linenumber" name="633" href="#633">633</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="634" href="#634">634</a>     <strong class="jxr_keyword">public</strong> String toString()
<a class="jxr_linenumber" name="635" href="#635">635</a>     {
<a class="jxr_linenumber" name="636" href="#636">636</a>         StringBuilder sb = <strong class="jxr_keyword">new</strong> StringBuilder();
<a class="jxr_linenumber" name="637" href="#637">637</a> 
<a class="jxr_linenumber" name="638" href="#638">638</a>         sb.append( <span class="jxr_string">"Managed BTree"</span> );
<a class="jxr_linenumber" name="639" href="#639">639</a>         sb.append( <span class="jxr_string">"["</span> ).append( btreeHeader.getName() ).append( <span class="jxr_string">"]"</span> );
<a class="jxr_linenumber" name="640" href="#640">640</a>         sb.append( <span class="jxr_string">"( pageSize:"</span> ).append( btreeHeader.getPageSize() );
<a class="jxr_linenumber" name="641" href="#641">641</a> 
<a class="jxr_linenumber" name="642" href="#642">642</a>         <strong class="jxr_keyword">if</strong> ( rootPage != <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="643" href="#643">643</a>         {
<a class="jxr_linenumber" name="644" href="#644">644</a>             sb.append( <span class="jxr_string">", nbEntries:"</span> ).append( btreeHeader.getNbElems() );
<a class="jxr_linenumber" name="645" href="#645">645</a>         }
<a class="jxr_linenumber" name="646" href="#646">646</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="647" href="#647">647</a>         {
<a class="jxr_linenumber" name="648" href="#648">648</a>             sb.append( <span class="jxr_string">", nbEntries:"</span> ).append( 0 );
<a class="jxr_linenumber" name="649" href="#649">649</a>         }
<a class="jxr_linenumber" name="650" href="#650">650</a> 
<a class="jxr_linenumber" name="651" href="#651">651</a>         sb.append( <span class="jxr_string">", comparator:"</span> );
<a class="jxr_linenumber" name="652" href="#652">652</a> 
<a class="jxr_linenumber" name="653" href="#653">653</a>         <strong class="jxr_keyword">if</strong> ( keySerializer.getComparator() == <strong class="jxr_keyword">null</strong> )
<a class="jxr_linenumber" name="654" href="#654">654</a>         {
<a class="jxr_linenumber" name="655" href="#655">655</a>             sb.append( <span class="jxr_string">"null"</span> );
<a class="jxr_linenumber" name="656" href="#656">656</a>         }
<a class="jxr_linenumber" name="657" href="#657">657</a>         <strong class="jxr_keyword">else</strong>
<a class="jxr_linenumber" name="658" href="#658">658</a>         {
<a class="jxr_linenumber" name="659" href="#659">659</a>             sb.append( keySerializer.getComparator().getClass().getSimpleName() );
<a class="jxr_linenumber" name="660" href="#660">660</a>         }
<a class="jxr_linenumber" name="661" href="#661">661</a> 
<a class="jxr_linenumber" name="662" href="#662">662</a>         sb.append( <span class="jxr_string">", DuplicatesAllowed: "</span> ).append( btreeHeader.isAllowDuplicates() );
<a class="jxr_linenumber" name="663" href="#663">663</a> 
<a class="jxr_linenumber" name="664" href="#664">664</a>         sb.append( <span class="jxr_string">") : \n"</span> );
<a class="jxr_linenumber" name="665" href="#665">665</a>         sb.append( rootPage.dumpPage( <span class="jxr_string">""</span> ) );
<a class="jxr_linenumber" name="666" href="#666">666</a> 
<a class="jxr_linenumber" name="667" href="#667">667</a>         <strong class="jxr_keyword">return</strong> sb.toString();
<a class="jxr_linenumber" name="668" href="#668">668</a>     }
<a class="jxr_linenumber" name="669" href="#669">669</a> }
</pre>
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